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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef GIN_ARRAY_BUFFER_H_
- #define GIN_ARRAY_BUFFER_H_
- #include <stddef.h>
- #include <stdint.h>
- #include "base/allocator/partition_allocator/partition_alloc.h"
- #include "base/compiler_specific.h"
- #include "base/memory/ref_counted.h"
- #include "base/memory/shared_memory_mapper.h"
- #include "gin/converter.h"
- #include "gin/gin_export.h"
- #include "v8/include/v8-array-buffer.h"
- #include "v8/include/v8-forward.h"
- namespace gin {
- class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
- public:
- void* Allocate(size_t length) override;
- void* AllocateUninitialized(size_t length) override;
- void Free(void* data, size_t length) override;
- GIN_EXPORT static ArrayBufferAllocator* SharedInstance();
- private:
- friend class V8Initializer;
- void* AllocateInternal(size_t length, unsigned int flags);
- // Initialize the PartitionAlloc partition from which instances of this class
- // allocate memory. This is called after initializing V8 since, when enabled,
- // the V8 sandbox must be initialized first.
- static void InitializePartition();
- // The PartitionAlloc partition that instances of this class allocate memory
- // chunks from. When the V8 sandbox is enabled, this partition must be placed
- // inside of it. For that, PA's ConfigurablePool is created inside the V8
- // sandbox during initialization of V8, and this partition is then placed
- // inside the configurable pool during InitializePartition().
- static partition_alloc::ThreadSafePartitionRoot* partition_;
- };
- class GIN_EXPORT ArrayBuffer {
- public:
- ArrayBuffer();
- ArrayBuffer(v8::Isolate* isolate, v8::Local<v8::ArrayBuffer> buffer);
- ArrayBuffer(const ArrayBuffer&) = delete;
- ~ArrayBuffer();
- ArrayBuffer& operator=(const ArrayBuffer& other);
- void* bytes() const {
- return backing_store_ ? backing_store_->Data() : nullptr;
- }
- size_t num_bytes() const {
- return backing_store_ ? backing_store_->ByteLength() : 0;
- }
- private:
- std::shared_ptr<v8::BackingStore> backing_store_;
- };
- template<>
- struct GIN_EXPORT Converter<ArrayBuffer> {
- static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
- ArrayBuffer* out);
- };
- class GIN_EXPORT ArrayBufferView {
- public:
- ArrayBufferView();
- ArrayBufferView(v8::Isolate* isolate, v8::Local<v8::ArrayBufferView> view);
- ArrayBufferView(const ArrayBufferView&) = delete;
- ~ArrayBufferView();
- ArrayBufferView& operator=(const ArrayBufferView& other);
- void* bytes() const {
- return static_cast<uint8_t*>(array_buffer_.bytes()) + offset_;
- }
- size_t num_bytes() const { return num_bytes_; }
- private:
- ArrayBuffer array_buffer_;
- size_t offset_;
- size_t num_bytes_;
- };
- template<>
- struct GIN_EXPORT Converter<ArrayBufferView> {
- static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
- ArrayBufferView* out);
- };
- GIN_EXPORT base::SharedMemoryMapper* GetSharedMemoryMapperForArrayBuffers();
- } // namespace gin
- #endif // GIN_ARRAY_BUFFER_H_
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